Necticut



(No Model.)

F. M. WRIGHT 8v W. M. WOOD.

. CALENDAR CLOCK. No. e49,o25.

Patented Sept. 14, 1886.

N. PETERS. PnaiuLnrwmpmr. wnhmgmn. n. C.

UNITED STATES PATENT OFFICE.

FRANK M. VRTGHT, OF BRISTOL, AND VARREN M. VOOD, OF CHESHIRE, ASSIGNORSTO THE PARKER C\' THIPPL'E COMPANY, OF MERIDEN, CON- Nuo/Tiel fr.

CALENDAR-CLOCK.

.GPECFCATON forming part of Letters Patent No. 349,025, dated September14, 1886,

Serial No.19-2,5.l5. (No model.)

To all wtont it may concern:

Be it known that we, FRANK M. WRTGHT, of Bristol, in the county ofHartford and State ot' Connecticut, and XVARREN M. XVoon, of

Cheshire, in the county of New Haven and State of Connecticut, bothcitizens of the 'United States, have invented certain new and usefulImprovements in Clock-Calendars, of which the following is aspecilication. Our invention relates to improvements in clock-calendars;and the main objects of our improvements are to lessen the cost ofproduction, to simplify the construction, and to bring theday-of-the-month operating mechanism into a very compact form, so thecalendar may he applied to very small clocks.

1n the accompanying drawings, Figure l is a rear elevation of ourcalendar mechanism as mounted upon the hack of a clock-dial. Fig. 2o 2is a vfront elevation of the ordinary twelvehour dial-wheel with a pointattached for driving our calendar mechanism. Fig. 3 is a front elevationet the pinion with which the point on the twelve-hour wheel engages; andFig. 4 is a vertical section, partly in elevation, ot our calendar asapplied to the back ot' a clockdial, in connection with the twelve-hourwheel. All of the figures are on an enlarged scale. A designates thedial-back, in the center of 3o which isa tubular shaft, a, having uponthe rear side ofthe dial the day-of-the-month wheel B, provided withthirty-one teeth, and having upon the front of the dial the index lingeror pointer C, said pointer and wheel both being secured to the tubularshait a, so as to necessarily rotate together. This wheel is heldagainst accidental. rotation by means of the spring Z1.

D designates a pinion, which is mounted 4o upon a xed stud on thedial-back, as shown, and is held against accidental rotation by means ofthe spring c. This pinion D is of peculiar construction. lt is firstmade with eight leaves or teeth, like any ordinarypinion, after whichtour of theleaves are cut away or removed on one side, as shown in Fig.3, thereby producing four leaves, d, which, measuring in the directionot" the axis of said pinion, are of less thickness than the other teeth,while the other four teeth, c, are of the full thickness ofthe pinion.For convenience, we will term these the full teeth @,and half-teethd.This pinion is placed upon the stud on the dialback in proper positionto have the full teeth engage with the day-of-the-month wheel B, whilethe half-teeth d stand back ofthe plane of the day-of-the-month wheel B,so that they do not engage therewith.

E designates the ordinary twelve-hour wheel of a common clock, which isattached to the hour-hand socketf and connected with the clock-movementin any ordinary manner, so as to revolve once in twelve hours. XVesecure to this wheel or to the socket thereof a point or spur, g, toserve as a trip-pin for en gagement with the pinion D. Thus it will beseen that the pinion D is moved a fraction ot a revolution once intwelve hours. The full teeth e mesh or engage with the point y and theday-of-the-month wheel B, so that upon such engagement ot' the spur gand pinion D the day-of-the1nonth wheehB is moved one thirty-first of arevolution, or the space of one tooth. In twelve hours more the spuragain engages the pinion D; but this time it engages one ofthehalf-teeth d, and consequently the pinion D is moved without impartingany movement to the day-ofthemonth wheel. The operation will thuscontinue, moving the pinion D once in twelve hours and theday-of-themonth wheel B audits pointer oncein twentyfour hours.

The arrangement of the parts is very compact and simple, while thechanges are made in a much shorter space of time than would be the caseif the day-of-the-month wheel were moved by a twenty-four-hour wheel, ashere tofore.

XVe have shown our mechanism as applied directly to the back of' anordinary time-dial;

Y f i 2 349,025

but it is evident that the same mechanism may tially as described, andfor the purpose specibe applied in other positions without changingfied. the nature of our invention.

We claim as our invention- 5 'lhe combination of the twelve-hour wheelhaving an operating-spur, the day-of-the- Witnesses to the signature ofWright: month Wheel, and the pinion D, the latter p1o- J. L. RUTHERFORD,

vided with full teeth and half-teeth, all of F. S. WRIGHT.

which engage the spur or point of the twelve- Witnesses to the signatnieof Vood: 1o hour wheel, and only half of which'engage the J. L.RUTHERFORD,

teeth of the day-of-the-month wheel, substanl CHARLES L. RUssELL, J r.

